Dipole-dipole attraction

Definition

Dipole-dipole attraction is an intermolecular force between polar molecules, where the positive end of one molecule is attracted to the negative end of another. This type of interaction is stronger than London dispersion forces but weaker than hydrogen bonds.

5 Must Know Facts For Your Next Test

1. Dipole-dipole attractions occur only in polar molecules.
2. The strength of dipole-dipole interactions increases with the polarity of the molecules involved.
3. Dipole-dipole attractions contribute to higher melting and boiling points in substances compared to nonpolar molecules with similar molecular weights.
4. These interactions are directional, meaning the orientation of the molecules affects the strength of the attraction.
5. In a mixture of polar and nonpolar substances, dipole-dipole attractions can lead to phase separation due to differences in intermolecular forces.

Related terms

London Dispersion Forces:

Weak intermolecular forces arising from temporary dipoles induced in atoms or molecules.

Hydrogen Bonding:

A strong type of dipole-dipole interaction occurring when hydrogen is bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine.

Intermolecular Forces:

Forces that mediate interaction between molecules, including London dispersion forces, dipole-dipole interactions, and hydrogen bonds.